NEW DELHI: How much red meat you eat, alcohol you drink and time you spend on a brisk walk could be what decides your chances of getting cancer.

In a landmark study to pinpoint the possible links between diet, obesity and cancer, scientists have found convincing evidence to prove that over 40% of all cancers are a direct result of diet, physical build and exercise habits.

Headed by Sir Michael Marmot, professor of epidemiology at University College London, and professor Martin Wiseman from the World Cancer Research Fund, a 21-member elite panel analysed over 7,000 studies carried out in the last 40 years to access the actual links between lifestyle and cancer.

The panel's 571-page report - Food, Nutrition, Physical Activity and the Prevention of Cancer - prepared after five years of analysis, has made some crucial recommendations. The scientists confirmed that carrying extra weight, particularly around the waist, increased chances of cancer of the oesophagus, pancreas, colon, kidney and uterus drastically, as well as postmenopausal breast cancer.

Exercising for at least 30 minutes a day was vital. Physical activity in any form protected against colon and womb cancer. It strengthened immunity, helped keep the digestive system healthy and allowed for the consumption of more cancer-protective nutrients.

The researchers said men should limit their alcohol intake to two drinks a day and women one. According to them, alcohol causes cancer of the mouth, pharynx and larynx, oesophagus and breast. They also pointed to probable evidence that drinking was a cause of liver and bowel cancer in women.

Red meat, such as mutton, beef, pork and lamb, were found to have a direct link in causing colorectal cancer. It's consumption should be limited to 500 gm a week and should be replaced with poultry, fish and eggs.

Processed meats like bacon, ham and sausages should also be avoided, the researchers said. A minimum of 400 gm of fruits and vegetables should be consumed every day while salt consumption should not exceed 6 gm daily.